Table 1. Number of frequent users each year and relative to the first year.

Prevalence for persistent frequent use is in italic.

	First year	Second year	Third year
Frequent users each year
Total (n)	17,981	20,700	22,387
Percentage relative to cohort	6.0	7.0	7.5
Frequent users who remain frequent users relative to first year
Total (n)	17,981	6,132	3,357
Percentage relative to cohort	6.0	2.1	1.1
Percentage relative to first year frequent users	100	34.1	18.7